Monarch ACT 5 – 6 – 8 Series End Suction Centrifugal Pump & Repair Parts
Monarch ACT 5, 6, and 8 End Suction Centrifugal Pump
The Monarch ACT 5 Series end suction centrifugal pumps deliver reliable performance for pressure boosting and fluid transfer applications. Designed with a versatile frame-mount configuration, these pumps accommodate either belt drive or direct drive setups through a flexible coupling, allowing seamless integration with the motor or engine of your choice.
Built with thick-wall cast gray iron casings and high-efficiency enclosed impellers, the Monarch ACT 5 Series includes the ACT-5SD, ACT-6SD, and ACT-8SD models. Whether you need the corrosion-resistant glass-filled Noryl impellers of the ACT-5SD and ACT-6SD models or the rugged cast gray iron construction of the ACT-8SD, this series provides durable and dependable solutions for agricultural, industrial, and pressure boosting systems.
Key Features and Benefits
- Versatile Drive Options: Frame mount design supports both belt drive and direct drive through flexible coupling, compatible with various motors and engines.
- Pressure Boosting Design: Thick-wall cast gray iron casing is specifically engineered for pressure boosting applications and high-pressure environments.
- Flexible Port Options: Available with discharge openings in 1″, 1¼”, and 2″ NPT sizes to match your system requirements.
- Reliable Sealing: Equipped with Buna and carbon ceramic mechanical seals for excellent leak prevention and chemical resistance.
- High-Efficiency Impellers: ACT-5SD and ACT-6SD feature glass filled noryl impellers for corrosion resistance, while ACT-8SD utilizes cast gray iron impellers for heavy-duty applications.
- Enclosed Impeller Design: Maximizes hydraulic efficiency and reduces maintenance requirements.
- Dual Speed Options: ACT-8SD available in both 3450 RPM and 1750 RPM configurations for flexible performance matching.
Applications
The Monarch ACT Series is engineered for demanding fluid handling tasks across multiple industries:
- Pressure Boosting Systems
- Agricultural Irrigation and Spraying
- Fertilizer and Chemical Transfer
- Industrial Water Systems
- Engine-Driven Pump Systems
- Commercial Water Transfer
Technical Specifications
Performance Chart
The following performance data shows total head in feet and corresponding capacities in U.S. GPM for each model configuration.
| Model No. | RPM | HP | Total Head in Feet Capacities in U.S. GPM |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 120 | 140 | |||
| ACT-5SD | 3450 | 2 | – | – | 65 | 62 | 58 | 53 | 47 | 39 | 30 | 15 | – |
| ACT-6SD | 3450 | 2½ | – | 92 | 87 | 84 | 79 | 73 | 66 | 58 | 48 | 15 | – |
| ACT-8SD | 3450 | 5 | – | 170 | 166 | 160 | 152 | 144 | 136 | 126 | 116 | 90 | 38 |
| ACT-8SD | 1750 | 1 | 78 | 56 | – | – | – | – | – | – | – | – | – |
ACT-SD Series Specifications
| Model No. | Order No. | Suction NPT | Discharge NPT | Ship Wt. (lbs.) | Transmission Data |
|---|---|---|---|---|---|
| ACT-5SD | 614992 | 1½” | 1″ | 16 | Shaft Size ¾” Keyway 3/16″ |
| ACT-6SD | 614993 | 1½” | 1¼” | 18 | Shaft Size ¾” Keyway 3/16″ |
| ACT-8SD | 614994 | 2″ | 2″ | 21 | Shaft assembly with sealed ball bearings |
Dimensional Specifications (Inches)
| Model | Suct. NPT |
Disch. NPT |
CP | DD | E | F | L | M | O | X | Y | ZC | ZO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ACT-5SD | 1½” | 1″ | 8.90 | 3.60 | 4.25 | 2.34 | 2 | 9.33 | 4.79 | 2.62 | 4.00 | 3.69 | |
| ACT-6SD | 1½” | 1½” | 9.28 | 4.06 | 4.25 | 2.46 | 2 | 10.81 | 6.31 | 2.88 | 4.72 | 8.84 | |
| ACT-8SD | 2″ | 2″ | 11.38 | 4.59 | 4.00 | 2 | 2.88 | 4 | 10.96 | 6.31 | 3.25 | 5.69 | 4.69 |
Repair Parts List
Maintain your Monarch ACT Series pump with genuine replacement parts. Use the reference numbers below to identify components for your specific model.
| Ref. # | Code # | -5SD Qty |
-6SD Qty |
-8SD Qty |
Description |
|---|---|---|---|---|---|
| 1 | 437842 | 1 | 1 | 1 | Casing |
| 1*** | 437839 | 1 | Casing | ||
| 2* | 433126 | 1 | Impeller | ||
| 2* | 433128 | 1 | Impeller | ||
| 2* | 437813 | 1 | Impeller | ||
| 7 | 437812 | 1 | 1 | 1 | Seal Plate |
| 9 | 226750 | 1 | 1 | 1 | Bolt 1/4″ UNC x 1″ |
| 10 | 266008 | 1 | 1 | 1 | Sleeve |
| 13 | 175000 | 1 | 1 | 1 | Washer Plain, 1/4 NOM |
| 15 | 164631 | 4 | Stud 3/8″ x 1-1/2″ | ||
| 15 | 164641 | 4 | 4 | 4 | Stud 3/8″ x 1-3/4″ |
| 23 | 176230 | 4 | 4 | 4 | Washer Spring 3/8 NOM |
| 24 | 227830 | 4 | 4 | 4 | Nut Hex 3/8″ |
| 25 | 185620 | 2 | 2 | 3 | Pipe Plug 1/4 |
| 26* | 193914 | 1 | Gasket | ||
| 26* | 193913 | 1 | Gasket | ||
| 26* | 198995 | 1 | O Ring #165 | ||
| 27 | 191791 | 1 | Flinger | ||
| 27 | 190847 | 1 | 1 | Flinger | |
| 31 | 240230 | 1 | Mechanical Seal | ||
| 32 | 240195 | 1 | 1 | Mechanical Seal | |
| 52 | 437871 | 1 | Transmission Housing | ||
| 52 | 437872 | 1 | Transmission Housing | ||
| 52 | 437851 | 1 | Transmission Housing | ||
| 53 | 438455 | 1 | Shaft | ||
| 53 | 437852 | 1 | Shaft (Ext. 1-29/64″) | ||
| 53 | 437854 | 1 | Shaft (Ext. 1-47/64″)** | ||
| 54 | 110216 | 2 | Ball Bearing | ||
| 56 | 137930 | 1 | 1 | Retaining Ring | |
| 57 | 137982 | 1 | Retaining Ring | ||
| 57* | 199245 | 1 | 1 | Lip Seal | |
| 58 | 400210 | 1 | 1 | 1 | Key 3/16 x 3/16 x 3/4″ |
| 59 | 432250 | 1 | Key 3/16 Sq. x 1″ (for Shaft #437852) | ||
| 59 | 432231 | 1 | Key 3/16 Sq. x 1-1/4″** (for Shaft #437854) | ||
| 60 | 185910 | 1 | 1 | 1 | Pipe Plug 1/8″ |